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Fog is a common phenomenon in many Indian regions during the winter months. Due to a drop in temperatures, the water vapor condenses into tiny water droplets forming Fog. Fog can significantly reduce the visibility to less than 1 KM. As a running train needs high visibility to move at top speed, so trains are delayed due to fog.

Why are trains delayed due to fog?

There are various factors which contribute to delayed trains in Indian railways when there is fog around.The first factor is: Indian railways always gives a priority to passenger's safety over speed. So, when the
visibility is not adequate, the trains (under the mandate) run much slower than their average speed.Secondly, Indian railways signaling system depends largely on visibility rather than electronic communication. When there is fog around, the train drivers cannot see the signals. Thirdly, the anti-fog
technologies are still in the experimental stages and have not been implemented completely.

What are the ripple effects caused by fog train delays?

There are many parts of India, where fog is a non-entity. But that does not mean that train late status in these states is any better than the rest of India. This is due to the ripple effects of trains delayed due to fog.One has to understand that majority of rail tracks in India are double line, which means a train can pass through only if the earlier train vacates the route. When a train is delayed due to fog, it can affect the schedule of other trains along the same route. Secondly, Premium trains (such as Rajdhani, Duronto,
Shatabdi) enjoy the privilege of being provided the highest priority at signals. This again, impacts the delay of other trains.

What is the impact of fog on train cancellations?

A quick data analysis about fog train delays shows that as many as 2358 were canceled in 2016. And already 885 trains have been canceled within the first winter month of 2017. This is why it is essential for passengers to check if train is rescheduled or canceled prior to their journey.

How many trains are rescheduled due to fog?

Owing to huge delays and often unavailability of vacant tracks, there are many trains which have to be rescheduled during the fog infested months. 18,039 were rescheduled due to fog in 2016, and already 3,196 have been rescheduled in 2017. Before journeying in the winter months, do care to check the reschedule train status.